A rare silicate mineral composed of calcium, aluminum, and silicon oxides, found in metamorphic rocks.
The etymology is uncertain, but it follows the standard -ite suffix for minerals. It may derive from Greek allagē (exchange), suggesting a mineral formed through exchange reactions.
Allagite is so rare that most geologists never hold a specimen in their whole career—it's found only in a handful of locations where rocks were exposed to extreme heat and pressure in the deep Earth.
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